.top{
    height: 183px;
    width: 780px;
    margin-bottom: 2px;
}
.banner{
    width: 780px;
    height: 150px;
    background: url(../img/banner.jpg) no-repeat;
}
.nav li{
    float: left;
    line-height: 33px;
    width: 78px;
    text-align: center;
    background: url(../img/button1.jpg);
    
}
.nav li a{
    color: #206196;
    display: block;
    width: 100%;
    text-decoration: underline;
}
